drivers/pinctrl/pinconf-generic.c - kernel/msm-5.4 - Gitiles

 /*
  * Core driver for the generic pin config portions of the pin control subsystem
  *
  * Copyright (C) 2011 ST-Ericsson SA
  * Written on behalf of Linaro for ST-Ericsson
  *
  * Author: Linus Walleij <linus.walleij@linaro.org>
  *
  * License terms: GNU General Public License (GPL) version 2
  */

 #define pr_fmt(fmt) "generic pinconfig core: " fmt

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinconf.h>
 #include <linux/pinctrl/pinconf-generic.h>
 #include <linux/of.h>
 #include "core.h"
 #include "pinconf.h"
 #include "pinctrl-utils.h"

 #ifdef CONFIG_DEBUG_FS
 static const struct pin_config_item conf_items[] = {
 	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
 	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
 	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
 	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
 	PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
 				"input bias pull to pin specific state", NULL, false),
 	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
 	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
 	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
 	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
 	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
 	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
 	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
 	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
 	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
 	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
 	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
 	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
 	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
 };

 static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
 				     struct seq_file *s, const char *gname,
 				     unsigned pin,
 				     const struct pin_config_item *items,
 				     int nitems, int *print_sep)
 {
 	int i;

 	for (i = 0; i < nitems; i++) {
 		unsigned long config;
 		int ret;

 		/* We want to check out this parameter */
 		config = pinconf_to_config_packed(items[i].param, 0);
 		if (gname)
 			ret = pin_config_group_get(dev_name(pctldev->dev),
 						   gname, &config);
 		else
 			ret = pin_config_get_for_pin(pctldev, pin, &config);
 		/* These are legal errors */
 		if (ret == -EINVAL || ret == -ENOTSUPP)
 			continue;
 		if (ret) {
 			seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
 			continue;
 		}
 		/* comma between multiple configs */
 		if (*print_sep)
 			seq_puts(s, ", ");
 		*print_sep = 1;
 		seq_puts(s, items[i].display);
 		/* Print unit if available */
 		if (items[i].has_arg) {
 			seq_printf(s, " (%u",
 				   pinconf_to_config_argument(config));
 			if (items[i].format)
 				seq_printf(s, " %s)", items[i].format);
 			else
 				seq_puts(s, ")");
 		}
 	}
 }

 /**
  * pinconf_generic_dump_pins - Print information about pin or group of pins
  * @pctldev:	Pincontrol device
  * @s:		File to print to
  * @gname:	Group name specifying pins
  * @pin:	Pin number specyfying pin
  *
  * Print the pinconf configuration for the requested pin(s) to @s. Pins can be
  * specified either by pin using @pin or by group using @gname. Only one needs
  * to be specified the other can be NULL/0.
  */
 void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
 			       const char *gname, unsigned pin)
 {
 	const struct pinconf_ops *ops = pctldev->desc->confops;
 	int print_sep = 0;

 	if (!ops->is_generic)
 		return;

 	/* generic parameters */
 	pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
 				 ARRAY_SIZE(conf_items), &print_sep);
 	/* driver-specific parameters */
 	if (pctldev->desc->num_custom_params &&
 	    pctldev->desc->custom_conf_items)
 		pinconf_generic_dump_one(pctldev, s, gname, pin,
 					 pctldev->desc->custom_conf_items,
 					 pctldev->desc->num_custom_params,
 					 &print_sep);
 }

 void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
 				 struct seq_file *s, unsigned long config)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
 		if (pinconf_to_config_param(config) != conf_items[i].param)
 			continue;
 		seq_printf(s, "%s: 0x%x", conf_items[i].display,
 			   pinconf_to_config_argument(config));
 	}

 	if (!pctldev->desc->num_custom_params ||
 	    !pctldev->desc->custom_conf_items)
 		return;

 	for (i = 0; i < pctldev->desc->num_custom_params; i++) {
 		if (pinconf_to_config_param(config) !=
 		    pctldev->desc->custom_conf_items[i].param)
 			continue;
 		seq_printf(s, "%s: 0x%x",
 				pctldev->desc->custom_conf_items[i].display,
 				pinconf_to_config_argument(config));
 	}
 }
 EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
 #endif

 #ifdef CONFIG_OF
 static const struct pinconf_generic_params dt_params[] = {
 	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
 	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
 	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
 	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
 	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
 	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
 	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
 	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
 	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
 	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
 	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
 	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
 	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
 	{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
 	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
 	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
 	{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
 	{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
 	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
 	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
 	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
 	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
 };

 /**
  * parse_dt_cfg() - Parse DT pinconf parameters
  * @np:	DT node
  * @params:	Array of describing generic parameters
  * @count:	Number of entries in @params
  * @cfg:	Array of parsed config options
  * @ncfg:	Number of entries in @cfg
  *
  * Parse the config options described in @params from @np and puts the result
  * in @cfg. @cfg does not need to be empty, entries are added beginning at
  * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
  * needs to have enough memory allocated to hold all possible entries.
  */
 static void parse_dt_cfg(struct device_node *np,
 			 const struct pinconf_generic_params *params,
 			 unsigned int count, unsigned long *cfg,
 			 unsigned int *ncfg)
 {
 	int i;

 	for (i = 0; i < count; i++) {
 		u32 val;
 		int ret;
 		const struct pinconf_generic_params *par = &params[i];

 		ret = of_property_read_u32(np, par->property, &val);

 		/* property not found */
 		if (ret == -EINVAL)
 			continue;

 		/* use default value, when no value is specified */
 		if (ret)
 			val = par->default_value;

 		pr_debug("found %s with value %u\n", par->property, val);
 		cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
 		(*ncfg)++;
 	}
 }

 /**
  * pinconf_generic_parse_dt_config()
  * parse the config properties into generic pinconfig values.
  * @np: node containing the pinconfig properties
  * @configs: array with nconfigs entries containing the generic pinconf values
  *           must be freed when no longer necessary.
  * @nconfigs: umber of configurations
  */
 int pinconf_generic_parse_dt_config(struct device_node *np,
 				    struct pinctrl_dev *pctldev,
 				    unsigned long **configs,
 				    unsigned int *nconfigs)
 {
 	unsigned long *cfg;
 	unsigned int max_cfg, ncfg = 0;
 	int ret;

 	if (!np)
 		return -EINVAL;

 	/* allocate a temporary array big enough to hold one of each option */
 	max_cfg = ARRAY_SIZE(dt_params);
 	if (pctldev)
 		max_cfg += pctldev->desc->num_custom_params;
 	cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
 	if (!cfg)
 		return -ENOMEM;

 	parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
 	if (pctldev && pctldev->desc->num_custom_params &&
 		pctldev->desc->custom_params)
 		parse_dt_cfg(np, pctldev->desc->custom_params,
 			     pctldev->desc->num_custom_params, cfg, &ncfg);

 	ret = 0;

 	/* no configs found at all */
 	if (ncfg == 0) {
 		*configs = NULL;
 		*nconfigs = 0;
 		goto out;
 	}

 	/*
 	 * Now limit the number of configs to the real number of
 	 * found properties.
 	 */
 	*configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
 	if (!*configs) {
 		ret = -ENOMEM;
 		goto out;
 	}

 	*nconfigs = ncfg;

 out:
 	kfree(cfg);
 	return ret;
 }

 int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 		struct device_node *np, struct pinctrl_map **map,
 		unsigned *reserved_maps, unsigned *num_maps,
 		enum pinctrl_map_type type)
 {
 	int ret;
 	const char *function;
 	struct device *dev = pctldev->dev;
 	unsigned long *configs = NULL;
 	unsigned num_configs = 0;
 	unsigned reserve, strings_count;
 	struct property *prop;
 	const char *group;
 	const char *subnode_target_type = "pins";

 	ret = of_property_count_strings(np, "pins");
 	if (ret < 0) {
 		ret = of_property_count_strings(np, "groups");
 		if (ret < 0)
 			/* skip this node; may contain config child nodes */
 			return 0;
 		if (type == PIN_MAP_TYPE_INVALID)
 			type = PIN_MAP_TYPE_CONFIGS_GROUP;
 		subnode_target_type = "groups";
 	} else {
 		if (type == PIN_MAP_TYPE_INVALID)
 			type = PIN_MAP_TYPE_CONFIGS_PIN;
 	}
 	strings_count = ret;

 	ret = of_property_read_string(np, "function", &function);
 	if (ret < 0) {
 		/* EINVAL=missing, which is fine since it's optional */
 		if (ret != -EINVAL)
 			dev_err(dev, "%s: could not parse property function\n",
 				of_node_full_name(np));
 		function = NULL;
 	}

 	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
 					      &num_configs);
 	if (ret < 0) {
 		dev_err(dev, "%s: could not parse node property\n",
 			of_node_full_name(np));
 		return ret;
 	}

 	reserve = 0;
 	if (function != NULL)
 		reserve++;
 	if (num_configs)
 		reserve++;

 	reserve *= strings_count;

 	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
 			num_maps, reserve);
 	if (ret < 0)
 		goto exit;

 	of_property_for_each_string(np, subnode_target_type, prop, group) {
 		if (function) {
 			ret = pinctrl_utils_add_map_mux(pctldev, map,
 					reserved_maps, num_maps, group,
 					function);
 			if (ret < 0)
 				goto exit;
 		}

 		if (num_configs) {
 			ret = pinctrl_utils_add_map_configs(pctldev, map,
 					reserved_maps, num_maps, group, configs,
 					num_configs, type);
 			if (ret < 0)
 				goto exit;
 		}
 	}
 	ret = 0;

 exit:
 	kfree(configs);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);

 int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
 		struct device_node *np_config, struct pinctrl_map **map,
 		unsigned *num_maps, enum pinctrl_map_type type)
 {
 	unsigned reserved_maps;
 	struct device_node *np;
 	int ret;

 	reserved_maps = 0;
 	*map = NULL;
 	*num_maps = 0;

 	ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
 						&reserved_maps, num_maps, type);
 	if (ret < 0)
 		goto exit;

 	for_each_available_child_of_node(np_config, np) {
 		ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
 					&reserved_maps, num_maps, type);
 		if (ret < 0)
 			goto exit;
 	}
 	return 0;

 exit:
 	pinctrl_utils_free_map(pctldev, *map, *num_maps);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);

 void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev,
 				 struct pinctrl_map *map,
 				 unsigned num_maps)
 {
 	pinctrl_utils_free_map(pctldev, map, num_maps);
 }
 EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map);

 #endif
	/*
	* Core driver for the generic pin config portions of the pin control subsystem
	*
	* Copyright (C) 2011 ST-Ericsson SA
	* Written on behalf of Linaro for ST-Ericsson
	*
	* Author: Linus Walleij <linus.walleij@linaro.org>
	*
	* License terms: GNU General Public License (GPL) version 2
	*/

	#define pr_fmt(fmt) "generic pinconfig core: " fmt

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/device.h>
	#include <linux/slab.h>
	#include <linux/debugfs.h>
	#include <linux/seq_file.h>
	#include <linux/pinctrl/pinctrl.h>
	#include <linux/pinctrl/pinconf.h>
	#include <linux/pinctrl/pinconf-generic.h>
	#include <linux/of.h>
	#include "core.h"
	#include "pinconf.h"
	#include "pinctrl-utils.h"

	#ifdef CONFIG_DEBUG_FS
	static const struct pin_config_item conf_items[] = {
	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
	"input bias pull to pin specific state", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
	};

	static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
	struct seq_file s, const char gname,
	unsigned pin,
	const struct pin_config_item *items,
	int nitems, int *print_sep)
	{
	int i;

	for (i = 0; i < nitems; i++) {
	unsigned long config;
	int ret;

	/* We want to check out this parameter */
	config = pinconf_to_config_packed(items[i].param, 0);
	if (gname)
	ret = pin_config_group_get(dev_name(pctldev->dev),
	gname, &config);
	else
	ret = pin_config_get_for_pin(pctldev, pin, &config);
	/* These are legal errors */
	if (ret == -EINVAL \|\| ret == -ENOTSUPP)
	continue;
	if (ret) {
	seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
	continue;
	}
	/* comma between multiple configs */
	if (*print_sep)
	seq_puts(s, ", ");
	*print_sep = 1;
	seq_puts(s, items[i].display);
	/* Print unit if available */
	if (items[i].has_arg) {
	seq_printf(s, " (%u",
	pinconf_to_config_argument(config));
	if (items[i].format)
	seq_printf(s, " %s)", items[i].format);
	else
	seq_puts(s, ")");
	}
	}
	}

	/**
	* pinconf_generic_dump_pins - Print information about pin or group of pins
	* @pctldev: Pincontrol device
	* @s: File to print to
	* @gname: Group name specifying pins
	* @pin: Pin number specyfying pin
	*
	* Print the pinconf configuration for the requested pin(s) to @s. Pins can be
	* specified either by pin using @pin or by group using @gname. Only one needs
	* to be specified the other can be NULL/0.
	*/
	void pinconf_generic_dump_pins(struct pinctrl_dev pctldev, struct seq_file s,
	const char *gname, unsigned pin)
	{
	const struct pinconf_ops *ops = pctldev->desc->confops;
	int print_sep = 0;

	if (!ops->is_generic)
	return;

	/* generic parameters */
	pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
	ARRAY_SIZE(conf_items), &print_sep);
	/* driver-specific parameters */
	if (pctldev->desc->num_custom_params &&
	pctldev->desc->custom_conf_items)
	pinconf_generic_dump_one(pctldev, s, gname, pin,
	pctldev->desc->custom_conf_items,
	pctldev->desc->num_custom_params,
	&print_sep);
	}

	void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
	struct seq_file *s, unsigned long config)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
	if (pinconf_to_config_param(config) != conf_items[i].param)
	continue;
	seq_printf(s, "%s: 0x%x", conf_items[i].display,
	pinconf_to_config_argument(config));
	}

	if (!pctldev->desc->num_custom_params \|\|
	!pctldev->desc->custom_conf_items)
	return;

	for (i = 0; i < pctldev->desc->num_custom_params; i++) {
	if (pinconf_to_config_param(config) !=
	pctldev->desc->custom_conf_items[i].param)
	continue;
	seq_printf(s, "%s: 0x%x",
	pctldev->desc->custom_conf_items[i].display,
	pinconf_to_config_argument(config));
	}
	}
	EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
	#endif

	#ifdef CONFIG_OF
	static const struct pinconf_generic_params dt_params[] = {
	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
	{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
	{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
	{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
	};

	/**
	* parse_dt_cfg() - Parse DT pinconf parameters
	* @np: DT node
	* @params: Array of describing generic parameters
	* @count: Number of entries in @params
	* @cfg: Array of parsed config options
	* @ncfg: Number of entries in @cfg
	*
	* Parse the config options described in @params from @np and puts the result
	* in @cfg. @cfg does not need to be empty, entries are added beginning at
	* @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
	* needs to have enough memory allocated to hold all possible entries.
	*/
	static void parse_dt_cfg(struct device_node *np,
	const struct pinconf_generic_params *params,
	unsigned int count, unsigned long *cfg,
	unsigned int *ncfg)
	{
	int i;

	for (i = 0; i < count; i++) {
	u32 val;
	int ret;
	const struct pinconf_generic_params *par = &params[i];

	ret = of_property_read_u32(np, par->property, &val);

	/* property not found */
	if (ret == -EINVAL)
	continue;

	/* use default value, when no value is specified */
	if (ret)
	val = par->default_value;

	pr_debug("found %s with value %u\n", par->property, val);
	cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
	(*ncfg)++;
	}
	}

	/**
	* pinconf_generic_parse_dt_config()
	* parse the config properties into generic pinconfig values.
	* @np: node containing the pinconfig properties
	* @configs: array with nconfigs entries containing the generic pinconf values
	* must be freed when no longer necessary.
	* @nconfigs: umber of configurations
	*/
	int pinconf_generic_parse_dt_config(struct device_node *np,
	struct pinctrl_dev *pctldev,
	unsigned long **configs,
	unsigned int *nconfigs)
	{
	unsigned long *cfg;
	unsigned int max_cfg, ncfg = 0;
	int ret;

	if (!np)
	return -EINVAL;

	/* allocate a temporary array big enough to hold one of each option */
	max_cfg = ARRAY_SIZE(dt_params);
	if (pctldev)
	max_cfg += pctldev->desc->num_custom_params;
	cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
	if (!cfg)
	return -ENOMEM;

	parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
	if (pctldev && pctldev->desc->num_custom_params &&
	pctldev->desc->custom_params)
	parse_dt_cfg(np, pctldev->desc->custom_params,
	pctldev->desc->num_custom_params, cfg, &ncfg);

	ret = 0;

	/* no configs found at all */
	if (ncfg == 0) {
	*configs = NULL;
	*nconfigs = 0;
	goto out;
	}

	/*
	* Now limit the number of configs to the real number of
	* found properties.
	*/
	configs = kmemdup(cfg, ncfg sizeof(unsigned long), GFP_KERNEL);
	if (!*configs) {
	ret = -ENOMEM;
	goto out;
	}

	*nconfigs = ncfg;

	out:
	kfree(cfg);
	return ret;
	}

	int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
	struct device_node np, struct pinctrl_map *map,
	unsigned reserved_maps, unsigned num_maps,
	enum pinctrl_map_type type)
	{
	int ret;
	const char *function;
	struct device *dev = pctldev->dev;
	unsigned long *configs = NULL;
	unsigned num_configs = 0;
	unsigned reserve, strings_count;
	struct property *prop;
	const char *group;
	const char *subnode_target_type = "pins";

	ret = of_property_count_strings(np, "pins");
	if (ret < 0) {
	ret = of_property_count_strings(np, "groups");
	if (ret < 0)
	/* skip this node; may contain config child nodes */
	return 0;
	if (type == PIN_MAP_TYPE_INVALID)
	type = PIN_MAP_TYPE_CONFIGS_GROUP;
	subnode_target_type = "groups";
	} else {
	if (type == PIN_MAP_TYPE_INVALID)
	type = PIN_MAP_TYPE_CONFIGS_PIN;
	}
	strings_count = ret;

	ret = of_property_read_string(np, "function", &function);
	if (ret < 0) {
	/* EINVAL=missing, which is fine since it's optional */
	if (ret != -EINVAL)
	dev_err(dev, "%s: could not parse property function\n",
	of_node_full_name(np));
	function = NULL;
	}

	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
	&num_configs);
	if (ret < 0) {
	dev_err(dev, "%s: could not parse node property\n",
	of_node_full_name(np));
	return ret;
	}

	reserve = 0;
	if (function != NULL)
	reserve++;
	if (num_configs)
	reserve++;

	reserve *= strings_count;

	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
	num_maps, reserve);
	if (ret < 0)
	goto exit;

	of_property_for_each_string(np, subnode_target_type, prop, group) {
	if (function) {
	ret = pinctrl_utils_add_map_mux(pctldev, map,
	reserved_maps, num_maps, group,
	function);
	if (ret < 0)
	goto exit;
	}

	if (num_configs) {
	ret = pinctrl_utils_add_map_configs(pctldev, map,
	reserved_maps, num_maps, group, configs,
	num_configs, type);
	if (ret < 0)
	goto exit;
	}
	}
	ret = 0;

	exit:
	kfree(configs);
	return ret;
	}
	EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);

	int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
	struct device_node np_config, struct pinctrl_map *map,
	unsigned *num_maps, enum pinctrl_map_type type)
	{
	unsigned reserved_maps;
	struct device_node *np;
	int ret;

	reserved_maps = 0;
	*map = NULL;
	*num_maps = 0;

	ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
	&reserved_maps, num_maps, type);
	if (ret < 0)
	goto exit;

	for_each_available_child_of_node(np_config, np) {
	ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
	&reserved_maps, num_maps, type);
	if (ret < 0)
	goto exit;
	}
	return 0;

	exit:
	pinctrl_utils_free_map(pctldev, map, num_maps);
	return ret;
	}
	EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);

	void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev,
	struct pinctrl_map *map,
	unsigned num_maps)
	{
	pinctrl_utils_free_map(pctldev, map, num_maps);
	}
	EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map);

	#endif